Two antique American gold coins sold for more than $US7.8 million ($8.67 million) when they went under the hammer in Florida, auction organisers have confirmed.

The first gold coin ever made for the United States - a Brasher Doubloon struck in 1787 by a neighbour of George Washington - fetched $US4.58 million ($5 million) Heritage Auctions said.

A nickel made at the Philadelphia Mint in 1913 that was once featured in an episode of the 1970s television show Hawaii Five-0 raised $US3.3 million ($3.67 million).

The coins were sold as part of a sale that has generated more than $US55 million ($61 million) so far, Heritage Auctions said.

"The legendary Brasher Doubloon is one of the most important coins in American history because it's the first gold coin struck for the young United States and it's one of only a handful that exist," Todd Imhof, executive vice president of Heritage Auctions, said.

The doubloon has been off the market since it was bought by a Chicago resident in 1979 for $US430,000.

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